Metal-contaminated soils, mine tailings and smelter sites managed by phytostabilization, phytoextraction and rhizoremediation (gentle remediation options) instead of excavation, soil washing and inert capping

Replaces: excavation, soil washing, bare or inert-capped tailings · Scope: smelter surroundings, mine tailings, metal-polluted farmland · Evidence: high (stabilization), medium–low (extraction speed)

The chemical problem#

• Smelters and mines leave large areas with diffuse Cd, Pb, Zn, Cu and As contamination — far too big to excavate.
• Bare tailings blow and wash away, spreading metals for decades.
• The chemical alternative, soil washing with acids or EDTA, destroys soil structure and life and creates contaminated wash water.

Product overview#

1. Phytostabilization — tolerant plants (grasses, shrubs, trees) plus amendments (compost, lime, biochar, iron oxides) immobilize metals in the root zone and stop erosion.
2. Phytoextraction — (hyper)accumulator plants (e.g. Noccaea, Sedum, Pteris for As) take metals into harvestable shoots; nickel “phytomining” can even recover metal for sale.
3. Phytomanagement — growing non-food biomass crops (willow, poplar, miscanthus, fibre crops) on contaminated land: risk reduction plus income.
4. Rhizoremediation — roots stimulate microbes that degrade residual organic pollutants (after RM01).

Active ingredient / Composition#

• Plant species chosen for metal tolerance and climate.
• Amendments: compost, biosolids (WC03), biochar, lime, iron/manganese oxides.
• Optional: plant-growth-promoting and metal-tolerant bacteria and mycorrhiza.

Key facts#

Advantages#

• Treats hectares or square kilometres at a cost no excavation project can match.
• Keeps soil in place and alive; creates vegetation, landscape and sometimes biomass income.
• Stops wind and water erosion of tailings — the main exposure route near many mines.
• Uses residues (compost, biosolids, biochar) as amendments.

Mode of action#

• Roots and amendments bind or precipitate metals (sorption, complexation, pH change) → lower mobility and plant uptake.
• Hyperaccumulators transport metals to shoots via specialised transporters and store them in vacuoles.
• Vegetation cover intercepts dust and reduces water infiltration and leaching.

Application#

Limitations#

• Phytoextraction is too slow for most redevelopment deadlines.
• Biomass from extraction crops is contaminated — needs controlled disposal or metal recovery.
• Deep contamination below the root zone is not reached.
• Regulators may not accept “risk management in place” instead of concentration targets.

Evidence of displacement — D1: works, adoption not proven#

Verified figures (the number is in the quoted sentence and the sentence is on the source page):

• performance — Phytoextraction combined with energy recovery can reduce environmental impacts by 30-100% compared to traditional treatments like soil washing and excavation plus landfill. (Spain, 2022; weak: hal.science)
• economics — Phytoremediation is a cost-effective alternative to physico-chemical processes, with a two-year project cost estimated at US$ 75,375.2/hm2 or US$ 37.7/m3. (global, not specified; peer-reviewed: mdpi-res.com)

Suppliers — real products and services (from the vendor index)#

Active vendors whose own card shows mine-site rehabilitation / revegetation or phytoremediation services.

Companies below are active vendors in the vendor index whose own card (profile / official website) shows this product or service — matched 2026-10-05 by keyword and checked by hand against the card text. Being listed is not an endorsement; open each card for evidence, contacts and status.

Update 2026-10-05: the new Europe dataset supplies this product — rows marked Europe below. For the other regions the gap noted above still stands unless a row says otherwise.

Honest finding (remaining): no card shows commercial metal phytoextraction or Ni agromining. Green Water Revolution (India) does phytoremediation of water, not soil, and is not cited.

Government funding signals#

Scanned 2026-10-01 (OpenAIRE + NSF); candidates reviewed by hand.

Signal: Moderate. 50 phytoremediation candidates, mostly smaller national projects (Czech Ministry of Education/MSM and Grant Agency projects on halophytes, energy plants and fibre crops for phytoremediation; GA0 GJ17-25536Y on contaminated soils). Large EU field programmes from earlier framework periods are reflected in the COST Action review cited below.

Scientific evidence#

• Salt DE, Smith RD, Raskin I (1998). Phytoremediation. Annual Review of Plant Physiology and Plant Molecular Biology 49: 643–668.
• Vangronsveld J, Herzig R, Weyens N, et al. (2009). Phytoremediation of contaminated soils and groundwater: lessons from the field. Environmental Science and Pollution Research 16: 765–794.
• Mench M, Lepp N, Bert V, et al. (2010). Successes and limitations of phytotechnologies at field scale: outcomes, assessment and outlook from COST Action 859. Journal of Soils and Sediments 10: 1039–1070.
• Mendez MO, Maier RM (2008). Phytostabilization of mine tailings in arid and semiarid environments—an emerging remediation technology. Environmental Health Perspectives 116: 278–283.

Bioeconomy value#

Mining and smelting regions (Norilsk, Karabash, Copperbelt, Andean mines) have contaminated areas that only plant-based methods can treat at an affordable cost. This is a supplier gap in the index, and it pairs with the mining rubric (M03).

Cross-links: M03 acid mine drainage; RM01 hydrocarbons; WC03 biosolids as amendment; NU03 compost.